- Usage in publication:
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- Thimble Limestone Member*
- Modifications:
-
- Named
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Great Basin province
Summary:
Pg. 13. Thimble Limestone Member of Carrara Formation. Name proposed for the 2nd from lowermost member (of 9). Present in southeastern California and southern Nevada. Consists of black, brown, and orange fossiliferous limestone. Is thin-bedded, each bed a couplet: lower part is calcarenite; upper part is argillaceous or dolomitic. Thickness ranges from <1 to >50 m. Conformably overlies Eagle Mountain Shale Member (new) and underlies Echo Shale Member (new), both of Carrara Formation. Age is Early Cambrian, based on fossils (trilobites).
Type locality: exposures on west side of Titanothere Canyon below Thimble Peak, Grapevine Mountains [Thimble Peak 7.5-min quadrangle], Inyo Co., southeastern CA. Named for Thimble Peak.
Source: GNU records (USGS DDS-6; Menlo GNULEX); US geologic names lexicon (USGS Bull. 1564, p. 170); Changes in stratigraphic nomenclature, 1979 (USGS Bull. 1502-A, p. A76).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).